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@uitzotatreatwt @ber ANDREW v. D. WEsTERvE-LT, oEQNf-EW BRUNSWICK. NEWJEEsEnAssIGNoE To -HIMSEL'E J. WWESTEEYELT, AND H. SMITH, JE; y 1 fparent No, 61,99?, end jetwfy 1861.

I'EumnfEuE-NTv IN GALIPEES.

Letiers4 l @te .Singulus nfetreri in tlgesrgttens ntent 1mb making gintnf tlg: time.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, ANDREW V. D. WEsrEuvEL'r, of New Brunswick, in thecountyof Middlesex, andi j State of` New Jersey, have invented a. newand useful Improvement in Calipers and Dividers; sind I do herebydeclare that the following is n. full, clear, und exact descriptionthereof, which will enable others skilled in tho art to make and use thesame, rfeience being had to the accompanying drawings, forming a. partof this specitfi cation, in which- Figure l represents a pnirof'culipers ha-vingmy improvement uttuched.

Figure 2 is mother view of thesame.

Figures 3 and 4 ure views o? the legs of the calipers separated.

Figure 5 is n view of :t portion 4of the calipers partially in section,und enlarged inthe scale.

Similar letters of reference indicate like parts. f i 1 f The nature ofthis inventionl consists in attaching a.V worm und worm-wheel to :i pairof calipers, dividers,l

v or comptdssesfur. the. rurrese Qfneninuenfi desirsthe less a.1,..sreds them @smiliemkinglmstsuref ,l

ments of' either internal or external work. The legs are fixed ut anypoint by the wormwheel, and the rneusixrc` ment is carried withcertainty, The worin` and worm-wheel are placed near the jointol' thelegs, wherefthey1 are entirely out of the way in handling and takingircasurements. i

t i he drawings (figs. 1 and 2) represent a, pair of calipers, of whicha a' arethe legs, joined by the pivotic.- "il On one end of the pivot cis allixedu small spur-wheel,4 i5, which engages in u. worm, e, that ismounted uponf two little standards d d', fusteneil on theoutside of oneof the legs, a. The shaft of the worm e projects through 1" one of thestandards d, and on the extreme e'n'd of it is placed u. milled disk orburr,f, for turningwith` the` thumb and linger. The leg ra, on which theworm e is mounted, turns freely on the pivot c, but the l g,u, fitted ona squure hub ou the pivot to 'prevent it` from turning thereon, and itissecured by :Eilat binding.. screw-nut, l1., on the end of the pivot, asshown at iig. 5.- i i The operation of this device is obvious: Byturning the worm e around by the burrf, ,the wormwheel' b`wllreceiverotary motion, which will open or close the legs ot' thecalipers, or' compasses `towliich they may be i applied, by n. slow andgraduated movement, und then4 `the legs will remain stationary at anypoint when the` motion of the worin ceases.- I Y v i l l `I'loving thusdescribed my invention, `what I clim as new, and desire tol secure by`Letters Patent, is--l` g 1. The pivot e, fitted on one end to the leg`a', forming the bearing for the two legs of the calipersypiio- 4 videdatthe other end with the spur-wheel b, operuting with the worm e,mounted on leg a, substantially as and i for the purpose specied. i i Yi i 2. The leg a, provided with standards d, bearing theworm ejand theleg a'4 to which the pivot c is secured in Acombination with-the pivotc, to which the wheel b is secured, constructed and operating in themanner and for the purpose specied. I Y l. l i i i The abovespeciication of my invention signed by me this. 29th dey of August,1866.

f "ANDREW V. D. WESTERVELE..."

Witnesses:

Wu. F. M cNAMAnA,

F. ROBERTS.

